I have a MACBOOK PRO I've been attempting to use my 22'' Vizio HDTV as a external display Im using a thunderbolt adapter with a HDMI chord to connect the tv and computer but I keep getting a message on the tv saying "PLEASE WAIT" while the computer screen flashes blue on and off. The tv is set on HDMI input and It seems like their is a syncing issue going on. Any suggestions?